Chapter 4: Programming in Matlab - College of the Redwoods

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404 Chapter 4 Programming in Matlab This function takes no input and export no output. However, it is possible to write GUI functions that accept input and export data back to the caller. Next we close all open figure windows and clear the command window. This is helpful during the development of the GUI, but once we have a tested and working program, we’ll remove these two commands from the GUI. We set limits on the domain of our plot, which we will also use when we initialize an axes on our figure window. It’s helpful to put these here and not have to change them in several places in our program. Finally, we initialize some colors we will use for our GUI components. Note that each color takes the form of a row vector with three entries, each of which must be a number between 0 and 1. The first entry is the percentage of red, the second the percentage of green, and the third entry is the percentage of blue. Most modern computers have color wheels where you can view a color and the percentages of red, green, and blue (in the RGB system) to make up the color. Next, we’ll add a figure window to the GUI. Add the following lines to the function M-file plotGUI and save. hFigure=figure(... ’Units’,’Pixels’,... ’Position’, [100 100 700 500],... ’Color’,figure_color,... ’MenuBar’,’none’,... ’ToolBar’,’none’,... ’NumberTitle’,’off’,... ’Name’,’Plot GUI’); Run the program. Some things to note: 1. We set Units to Pixels. Thereafter, all positioning commands are made in Pixels. Think of a pixel as one dot on your computer screen. Typical resolution on modern displays are of the order of 1024 by 768 pixels, but can be higher (or lower) depending on personal display settings on your computer. 2. Next we set the Position of the figure window at [100 100 700 500]. The first two measurements (100 and 100) are the location of the lower left-hand corner of the figure window, relative to the lower left-hand corner of your computer screen. The next two measurements (700 and 500) are the width and height of the figure window. All of these measurements are in pixels 3. Finally, we set the color, then turn off the menubar and toolbar as well as the usual number title that is displayed in a typical figure window (Figure 1,
Section 4.6 Nested Functions in Matlab 405 Figure 2, etc.). Then we give our figure window a meaningful name for the project, namely Plot GUI. 4. Note that we assign a handle to the figure window named hFigure. Every Matlab object can be associated with a handle for further reference. We will now add an axes to the figure window. Note that the axes object will be a “child” of the figure window (equivalently, the figure window is a “parent” of the axes object). Add the following lines to the file plotGUI and save. hAxes=axes(... ’Parent’,hFigure,... ’Units’,’Pixels’,... ’Position’,[50 50 400 400],... ’Xlim’,[xmin,xmax],... ’XGrid’,’on’,... ’YGrid’,’on’); Run the program. Things to note: 1. Note that the “Parent” of the axes object is set to hFigure, which is the numerical handle assigned to the figure window designated above. This makes the axes object a “child” of the figure window whose numerical handle is hFigure. 2. The unit of measurement for the axes object is also set to “Pixels.” 3. The position of the axes object is set to [50 50 400 400]. The first two numbers (50 and 50) set the lower left-hand corner of the axes object, relative to the lower left-hand corner of its parent, in this case the figure window designated by the handle hFigure. 4. The limits on the x-axis are set to [xmin,xmax] and the grid in both the x- and y-directions is turned ‘on’ (equivalent to using the grid on command). 5. Finally, note that we’ve assigned a handle hAxes to our axes object for further reference. Now that we have a figure window and axes object, let’s create some data and place a plot of the data on the axes object. Enter the following lines in plotGUI and save. % plot data x=linspace(xmin,xmax); y=sin(2*x); hLine=line(x,y);
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4 Programming In Matlab In this cha
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Section 4.1 Logical Arrays 261 4.1
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Chapter 4: Programming in Matlab - College of the Redwoods

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